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Core / shell structure of TiO2 coated MWCNT for high temperature processing and thermal protection of metal matrix composites

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Document pages: 11 pages

Abstract: The production of metal matrix composites to improve mechanical properties largely depends on the properties of reinforcing phase. Because multi walled carbon nanotubes (MWCNTs) have poor oxidation resistance and high reactivity with molten metal, the process conditions for producing MWCNTs reinforced metal matrix composites may be an obstacle to their successful use as reinforcements. Coating multi walled carbon nanotubes with ceramic materials as thermal protection materials will be an alternative method to improve oxidation stability. In this work, previously functionalized multi walled carbon nanotubes were coated with titanium dioxide (TiO2) layers of different thickness to form a core-shell structure. The coated nanotubes were heat treated at three different temperatures (500 ℃, 750 ℃ and 1000 ℃)bes in order to form a stable metal oxide structure. The MWCNT TiO2 hybrids produced were evaluated in terms of thermal stability. Thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (RS), and X-ray photoelectron spectroscopy (XPS) were performed in order to investigate TiO2-coated MWCNT structure and thermal stability under oxidative atmosphere. It was found that the thermal stability of the TiO2-coated MWCNTs was dependent of the TiO2 layer morphology that in turn depends on the heat treatment temperature.

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